Windows 10: KB4100347 Intel microcode updates for Windows 10 v1803 - September 13

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  1. Posts : 179
    Windows 10 (2), Win 8.1 (1), Win 7 (1)
       26 Aug 2018 #220

    Thanks,
    JohnD
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  2.    26 Aug 2018 #221

    ytdc564 said: View Post
    Is that regressive enough?



    The real question is: Does anyone have any ideas of a best place/places to get this reported?
    Cause the Microsoft support forums are next to useless, no MS staff there, just users helping other users.
    That's not undoing the microcode update, it's disabling the mitigation for all the threats. Subtly different.

    I don't particularly rate that DPC latency checker, it often gives variable results, showing errors on systems that aren't misbehaving.

    I applaud the fact that you have some kind of regression practice, but to blame the microcode update isn't accurate.

    I agree about the MS forums, they'd have you checking your system files and then everyone scratching their heads.
      My ComputersSystem Spec

  3.    26 Aug 2018 #222

    johnpd said: View Post
    Why am I getting this on an 8 year-old Lenovo Thinkpad (Clarksfield, CPUID 106E5) when it is not in the list of processors to update and I was under the understanding that anything this old would not get anything?

    JohnD
    Because your mcupdate_genuineIntel.dll is not the latest version, same as why all the AMD users are getting it too.

    As I think I've pointed out, this is still not great because they aren't even the latest uCodes. So the update will patch the uCode to a level but the Cumulative updates that require newer uCode won't have any effect.

    AFAIU the registry setting to disable ALL Spectre class vulnerabilities is just to disable a Memory management switch.

    I think it will be possible to achieve granularity by using older versions of the patch to have the microcode at a level that should enable only certain mitigations. Other threats that do not require microcode may be more tricky. If not installing the Cumulative patches is the only way then that's not a sustainable position.

    Of course, some of the mitigations do not carry a performance penalty, but blanket turning off of the memory management may disable those as well.

    We could do with a little direction on that from Microsoft, in that what their intentions with the updates are going forward and why there are two patches, one with older versions.
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  4.    26 Aug 2018 #223

    Although the little utility app show performance as "GOOD" I'm noticing a small delay on my operations. Is not a huge slowdown but I can tell the difference and it's very uncomfortable to me. I don't like the option of putting the WU in pause, because other updates will come and this one will probably be bundled in the future in other one, or if not, it will probably be included in the next service pack.

    That's why I want to know how to disable it. I will try to click on disable then reboot.

    Thanks.
      My ComputerSystem Spec

  5.    26 Aug 2018 #224

    eXtremeDevil said: View Post
    Although the little utility app show performance as "GOOD" I'm noticing a small delay on my operations. Is not a huge slowdown but I can tell the difference and it's very uncomfortable to me. I don't like the option of putting the WU in pause, because other updates will come and this one will probably be bundled in the future in other one, or if not, it will probably be included in the next service pack.

    That's why I want to know how to disable it. I will try to click on disable then reboot.

    Thanks.
    Looks like the Memory Management setting can be toggled against Spectre variant 2 only

    and against variant 4, variant 2 and Meltdown (variant 3) together

    https://support.microsoft.com/en-gb/...tive-execution

    No actual clue as to how InSpectre handles this, I assume the first option is all that is detected and disabled / enabled because it hasn't been updated to detect firmware updates either after those for variant 2.
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  6.    26 Aug 2018 #225

    winactive said: View Post
    Looks like the Memory Management setting can be toggled against Spectre variant 2 only

    and against variant 4, variant 2 and Meltdown (variant 3) together

    https://support.microsoft.com/en-gb/...tive-execution

    No actual clue as to how InSpectre handles this, I assume the first option is all that is detected and disabled / enabled because it hasn't been updated to detect firmware updates either after those for variant 2.

    This is a .reg file I tried, to handle mitigations for Spectre and Meltdown:

    Code:
    Windows Registry Editor Version 5.00
    
    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management]
    "FeatureSettingsOverride"=dword:00000008
    "FeatureSettingsOverrideMask"=dword:00000003
    
    ; https://support.microsoft.com/en-us/help/4073119/protect-against-speculative-execution-side-channel-vulnerabilities-in
    ;
    ; FeatureSettingsOverride values:
    ; 8 = Enable All (Speculative Store Bypass together with Spectre Variant 2 and Meltdown)  
    ; 3 = Disable both Spectre Variant 2 and Meltdown
    ; 2 = Disable Meltdown (Kernel VA Shadow)
    ; 1 = Disable Spectre Variant 2 (Branch Target Injection)
    ; 0 = Enable Spectre Variant 2 and Meltdown
    ;
    ; FeatureSettingsOverrideMask value is always 3
    To disable all mitigations you need to delete the two values:
    - FeatureSettingsOverride and
    - FeatureSettingsOverrideMask

    In my Registry, since I haven't installed any microcode updates from Microsoft and my hp (Insyde) BIOS is in microcode version 0x2B, I do not have the two entries.

    For more info from Intel, take a look here
    Last edited by ddelo; 26 Aug 2018 at 06:57.
      My ComputerSystem Spec

  7.    26 Aug 2018 #226

    ddelo said: View Post
    This is a .reg file I tried, to handle mitigations for Spectre and Meltdown:

    Code:
    Windows Registry Editor Version 5.00
    
    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management]
    "FeatureSettingsOverride"=dword:00000008
    "FeatureSettingsOverrideMask"=dword:00000003
    
    ; https://support.microsoft.com/en-us/help/4073119/protect-against-speculative-execution-side-channel-vulnerabilities-in
    ;
    ; FeatureSettingsOverride values:
    ; 8 = Enable All (Speculative Store Bypass together with Spectre Variant 2 and Meltdown)  
    ; 3 = Disable both Spectre Variant 2 and Meltdown
    ; 2 = Disable Meltdown (Kernel VA Shadow)
    ; 1 = Disable Spectre Variant 2 (Branch Target Injection)
    ; 0 = Enable Spectre Variant 2 and Meltdown
    ;
    ; FeatureSettingsOverrideMask value is always 3
    To disable all mitigations you need to delete the two values:
    - FeatureSettingsOverride and
    - FeatureSettingsOverrideMask

    In my Registry, since I haven't installed any microcode updates from Microsoft and my hp (Insyde) BIOS is in microcode version 0x2B, I do not have the two entries.

    For more info from Intel, take a look here
    I'm testing with values 0 and 1, what about the others? How can I find out if my CPU/MB needs them?
      My ComputerSystem Spec

  8.    26 Aug 2018 #227

    eXtremeDevil said: View Post
    I'm testing with values 0 and 1, what about the others? How can I find out if my CPU/MB needs them?
    Check the Intel document, to see what microcode revision you should have.
    If you don't have the one mentioned by Intel, check for a BIOS update at the manufacturer's site and install it. If one is not available, use the above reg file with values 8 and 3, in order to be protected.
      My ComputerSystem Spec

  9.    26 Aug 2018 #228

    My CPU is i7 4790K and it's not on the document :S
      My ComputerSystem Spec

  10.    26 Aug 2018 #229

    eXtremeDevil said: View Post
    My CPU is i7 4790K and it's not on the document :S
    Run Inspectre and see your CPUID. With that, look in the intel document. I believe that it is included. They have included CPUs earlier than yours.

    If not mistaken, it's a Haswell CPU
      My ComputerSystem Spec


 
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